龍燈 Ryūtō are kaika which appear just above the surface of the water on calm, peaceful nights. They create no heat, nor do they burn anything. They are only found in bodies of water which are home to dragons. Ryūtō start out as single orbs of flame which hover a few meters above the surface of the water. They soon begin to multiply, until there are countless orbs. These fireballs float about aimlessly along the water, stretching and shrinking and morphing their shapes. Some of them sink back into the water. Others float up into the sky or nestle into the treetops. At dawn, they merge back together into one orb before vanishing back into the sea. Read more: http://yokai.com/ryuutou/